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Finding the Fourth Proportional to 957.47, 1,321.81 and 644.38

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Solution

The fourth proportional to 957.47, 1,321.81 and 644.38 is: 889.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.47 : 1,321.81 = 644.38 : x
  2. Step 2: Convert to fraction form
    957.47/1,321.81 = 644.38/x
  3. Step 3: Cross multiply
    957.47x = 1,321.81 × 644.38
  4. Step 4: Simplify right side
    957.47x = 851,747.93
  5. Step 5: Solve for x
    x = 851,747.93/957.47
  6. Step 6: Final answer
    x = 889.58

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.